pub static META_VARIABLE_MISUSE: &Lint
Expand description
The meta_variable_misuse
lint detects possible meta-variable misuse
in macro definitions.
§Example
ⓘ
#![deny(meta_variable_misuse)]
macro_rules! foo {
() => {};
($( $i:ident = $($j:ident),+ );*) => { $( $( $i = $k; )+ )* };
}
fn main() {
foo!();
}
{{produces}}
§Explanation
There are quite a few different ways a macro_rules
macro can be
improperly defined. Many of these errors were previously only detected
when the macro was expanded or not at all. This lint is an attempt to
catch some of these problems when the macro is defined.
This lint is “allow” by default because it may have false positives and other issues. See issue #61053 for more details.